As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, AND AFTER ENGINE START, ENG EEC PROBE AND MACH PROBE LIGHT AFTER START STILL ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE T/S IAW ABX FIM 30-34 FAULT TREE 803. NO FAULTS NOTED. AIRCRAFT RETURNED TO SERVICE.